JPS6128790A - Water supply device - Google Patents

Abstract

PURPOSE:To eliminate possibility of water supply interruption during backup operation for eventual failure in a water supply arrangement consisting of a plurality of pumps by driving pumps not with a variable speed driving means but with a direct power supply in the even of failure. CONSTITUTION:In an arrangement in which No.1 pump 4-1 and No.2 pump 4-2 are alternately driven by a variable speed driving means INV, when excessive load is applied to either of the pumps, the corresponding thermal relay is actuated to close the contact TH1a or TH2a, and now the contact R1c of relay R1 is changed over from the (b) side to (a) side, to be connected with direct power supply according to position of the contact Z2c of an alternate relay Z2 so as to energize an electromagnetic contactor MC1 for putting the pump into operation. This provides perfect backup in the event of failure in the pumps with a quick rise, which assures free from generation of pressure drop.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は複数台の可変速ポンプを使用した給水装置に係
り、特に、可変速ポンプの不具合時も断水することなく
、給水を行っていくのに好適な保護運転装置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a water supply system using a plurality of variable speed pumps, and particularly to a water supply system that can supply water without water interruption even when a variable speed pump malfunctions. The present invention relates to a protective operation device suitable for.

〔発明の背景〕[Background of the invention]

従来から複数台の可変速ポンプと可変速駆動手段を組合
せ、台数制御運転及び、ポンプの吐出し圧力を制御して
給水を行っている。これの具体例を第１〜第４図により
説明する。Conventionally, a plurality of variable speed pumps and variable speed drive means have been combined to supply water by controlling the number of pumps and controlling the discharge pressure of the pumps. A specific example of this will be explained with reference to FIGS. 1 to 4.

第１図は給水系統を示す構成図であり、１は受水槽、２
−１．２−２は吸込管、３−１．　５−２は仕切弁、４
−１．ｊ−２はそれぞれ可紫速モーター５−１．５−２
よって駆動されるポンプ、６−１．６−２は逆止め弁、
７−１．７−２は仕切弁、８は給水管、Ｐ８は圧力セン
サー、Ｔは圧力タンクである。第２図は第１図で示す給
水系統の運転特性図で横軸に水量Ｑ、縦軸に圧力Ｈを取
って示す。ここで、曲線Ａ、　　Ｂ、　　Ｏ，Ｄ、　　
Ｋはそれぞれ、ポンプの運転速度が最高速度ＮｍａＸ、
Ｎ１＋Ｎ、、Ｎ３及び最低速度Ｎｍ１ｎの時のＱ−Ｈ性
能曲線を示す。Ｈ，は目標圧力（全揚程に相当する。）
であり、Ｑイ、Ｑ二はそれぞれ、目標圧力Ｈｏど特性曲
線Ａ、　　Ｄとの交点イ、二と対応するポンプの吐出し
量である。第３図は第１図で示す給水系統の駆動回路を
示し、第４図はその制御回路の大略を示す。同図に於い
て、ＦＷは電源、Ｍｅ、）ａ−Ｍｅ４ａは電磁接触器の
接点、工ＮＶは可変速駆動手段で、たとえばインバータ
装置である。又は前記可変速駆動手段に速度指令する速
度指令器、ＴＨ，、ＴＨ２はモータ５−１．５−２の過
負荷保護リレーのセンサ一部である。又、Ｍｅ６−Ｍｅ
、は前記した電磁接触器のコイル、Ｔ、−Ｔ、はタイマ
ーであり、Ｔ、ａ、Ｔ！ａはその一定時間後に閉じる時
限接点、Ｔ　Ｈ、ｂ、　ＴＨ，ｂは前記過負荷保護７ル
一〇接点、Ｒは接点Ｘ０〜Ｘ３より成り、電磁接触器Ｍ
ｃ６−Ｍｃ、の順序制御を行う順序制御手段である。Figure 1 is a configuration diagram showing the water supply system, where 1 is a water tank, 2
-1.2-2 is a suction pipe, 3-1. 5-2 is a gate valve, 4
-1. j-2 is purple speed motor 5-1.5-2 respectively
Therefore, the pump driven by 6-1.6-2 is a check valve,
7-1, 7-2 is a gate valve, 8 is a water supply pipe, P8 is a pressure sensor, and T is a pressure tank. FIG. 2 is a diagram showing the operating characteristics of the water supply system shown in FIG. 1, with the horizontal axis representing the water amount Q and the vertical axis representing the pressure H. Here, curves A, B, O, D,
K is the maximum operating speed of the pump NmaX,
The Q-H performance curve at N1+N, , N3 and the lowest speed Nm1n is shown. H, is the target pressure (corresponds to the total head)
, and Qi and Q2 are the pump discharge amounts corresponding to the intersections a and 2 with the characteristic curves A and D, such as the target pressure Ho, respectively. FIG. 3 shows a drive circuit for the water supply system shown in FIG. 1, and FIG. 4 shows an outline of the control circuit. In the figure, FW is a power source, Me, )a-Me4a are contacts of an electromagnetic contactor, and NV is a variable speed drive means, such as an inverter device. Alternatively, the speed command devices TH, TH2 that issue speed commands to the variable speed drive means are part of the sensor of the overload protection relay of the motor 5-1.5-2. Also, Me6-Me
, are the coils of the magnetic contactor described above, T, -T are timers, and T, a, T! a is a time contact that closes after a certain period of time, T H, b, TH, b are the overload protection 7 and 10 contacts, R is contact X0 to X3, and magnetic contactor M
This is an order control means for controlling the order of c6-Mc.

今、ポンプｌ１−１が使用水量Ｑ二、運転速度Ｎ、。Now, pump l1-1 uses water amount Q2 and operating speed N.

Ｑ−Ｈ性能曲線り上の二点で運転しているものとする。It is assumed that the vehicle is operating at two points on the Q-H performance curve.

この状卯より、使用水量が増加しＱイとなると、運転速
度がＮ　３−＃　Ｎ　２−ｓＮ　、−５−Ｎ　ｍ　ａ　
Ｘと増速し、運転点は二令ハ→口うイと移動し、ポンプ
の吐出し圧力Ｈ０を一定に保つ。又、使用水量が少なく
Ｑホとなったら流量センサーＦＳなどによりこれを検知
しポンプを停止させ、給水管の圧力がＨ８へ達したら再
びポンプを始動させる。さらに、このような給水装置で
はポンプの故障時のバックアップ機能を持っているもの
がある。From this situation, when the amount of water used increases and becomes Qi, the operating speed becomes N3-#N2-sN, -5-Nma
The speed increases to X, the operating point moves from second order C to mouth, and the pump discharge pressure H0 is kept constant. Also, when the amount of water used is low and reaches Qho, this is detected by a flow rate sensor FS and the pump is stopped, and when the pressure in the water supply pipe reaches H8, the pump is started again. Furthermore, some of these water supply devices have a backup function in case of pump failure.

このような給水装置では次のような問題点があった。Such water supply devices have the following problems.

一方のポンプが故障し、残り１台で可変速駆動手段によ
り給水する場合に、使用水量が少なくポンプが停止する
とポンプは停止しても慣性によつ損したりする問題が生
じる。この問題を解消するにはポンプが完全に停止する
までの時間だけ再始動を遅らせる必要がある。再始動を
遅らせると、圧力タンクの容量が小さい場合忙はこの間
に給水圧力が低下して瞬時断水となる問題が生じる。When one of the pumps breaks down and the remaining pump supplies water using the variable speed drive means, the problem arises that if the amount of water used is small and the pump stops, even if the pump stops, it will be damaged due to inertia. To solve this problem, it is necessary to delay restarting the pump until it has completely stopped. If the restart is delayed, if the capacity of the pressure tank is small, the water supply pressure will drop during this period, resulting in a momentary water cutoff.

〔発明の目的〕[Purpose of the invention]

本発明の目的はポンプの故障バックアップ運転時にも断
水することのない給水装置を提供することにある。An object of the present invention is to provide a water supply system that does not cause water outage even during backup operation due to pump failure.

〔発明の概要〕[Summary of the invention]

一般的に複数のポンプと１台の可変速駆動手段とを組合
せた給水装置では、一方のポンプが故障した場合に、残
りのポンプを可変速駆動手段により運転し給水を行う。Generally, in a water supply system that combines a plurality of pumps and one variable speed drive means, if one pump fails, the remaining pumps are operated by the variable speed drive means to supply water.

しかし、この方法では従来技術で述べたような問題点が
生じる。これは、可変速駆動手段のじか入れ始動に起因
するものである。このため、本発明は複数ポンプのうち
、いずれかが故障した場合には可変速駆動手段によらな
いで直接電源によりポンプを駆動することにある。However, this method causes the problems described in the prior art. This is due to the direct start of the variable speed drive means. For this reason, the present invention is directed to driving the pump directly by the power supply without using the variable speed drive means when any one of the plurality of pumps breaks down.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の実施例を第１．第３．第５．第６図によ
り説明する。第５図は本発明の一実施例である可変速駆
動手段から電源に切替えて運転した場合の運転特性図で
、第２図と同様に縦軸に圧力Ｈ１横軸に水量Ｑを取って
示す。曲線りはポンプ４−１．４−２を直接電源により
駆動した場合のＱ−Ｈ性能、Ｐｌは始動圧力、Ｐ２は停
止圧力である。第６図は本実施例の具体的な制御回路を
示し、第４図と同一符号で示す部品は同一意味を持つ。Hereinafter, examples of the present invention will be described in Section 1. Third. Fifth. This will be explained with reference to FIG. FIG. 5 is an operating characteristic diagram when the variable speed drive means, which is an embodiment of the present invention, is switched to the power source. As in FIG. 2, the vertical axis shows the pressure H, and the horizontal axis shows the water amount Q. . The curve indicates the QH performance when the pump 4-1.4-2 is directly driven by a power source, Pl is the starting pressure, and P2 is the stopping pressure. FIG. 6 shows a specific control circuit of this embodiment, and parts indicated by the same symbols as in FIG. 4 have the same meanings.

Ｒ７はポンプ故障時即ち過負荷保護リレーＴ　ＨＨ＊　
　ＴＨｔが動作した時にその接点Ｒ，ａ　をｂ側からａ
側に切替えるリレー、２．は電磁接触器ＭＯ！、Ｍｅ３
の接点Ｍｅ２’ｂ、Ｍｃ３’ｂが閉路時に、その接点Ｚ
、ｃ　をｂ側からａ側又はａ側からｂ側に切替える交互
リレーであり、可変速駆動手段工ＮＶによりポンプを運
転する場合に、ポンプが停止するたびに１号ポンプ４−
１．．２号ポンプ４−２を交互に切替えるものである。R7 is the overload protection relay THH*
When THt operates, its contact R,a is connected from side b to a.
relay to switch to the side, 2. is an electromagnetic contactor MO! , Me3
When the contacts Me2'b and Mc3'b are closed, the contact Z
, c is an alternate relay that switches from the b side to the a side or from the a side to the b side.When the pump is operated by the variable speed drive means NV, each time the pump stops, No.
1. ．． The No. 2 pump 4-2 is switched alternately.

又、２゜は電磁接触器Ｍｅ、、Ｍｅ４の接点Ｍ　ｃ　、
　’ｂ、Ｍｃ４ｂが閉路時に、その接点Ｚ、ｃ　をｂ側
からａ側又はａ側からｂ側に切替える交互リレーであジ
、直接電源ｐｗに接続して運転する場合に、前述の可変
速駆動手段工ＮＶＫより運転する場合と同様に、ポンプ
が停止するたびに１号ポンプａ−１，２号ポンプ４−２
を交互に切替えるものである。このように構成したもの
の詳細を次に説明する。Also, 2° is the contact point M c of the electromagnetic contactor Me, , Me4,
'b, Mc4b is an alternating relay that switches its contacts Z and c from the b side to the a side or from the a side to the b side when Mc4b is closed.When operating by directly connecting to the power supply pw, the above-mentioned variable speed drive As in the case of operation from Means Engineering NVK, whenever the pumps stop, No. 1 pump a-1, No. 2 pump 4-2
is switched alternately. The details of this configuration will be described below.

平常時は従来技術で説明したように可変速駆動手段工Ｎ
Ｖにより１号ポンプ４−１．又は２号ポンプを交互に運
転しているが、同ポンプのいずれか一方が過負荷運転に
よりサーマルリレーが動作しその接点ＴＨ，ａ又はＴＨ
，ａのいずれかが閉じると、リレーＲ１の接点Ｒ，ｃ　
がｂ側よりａ側に切替り、回路Ａが選択される。このた
め交互リレー２２の接点Ｚ、ｃ　の位置により、直接電
源ｐｗと接続され、電磁接触器Ｍｃ、又はＭｃ４が付勢
し、ポンプ４−１又はポンプ４−２が運転されるもので
ある。尚、この場合、ポンプは第５図に示す始動圧力Ｐ
１で始動し、停止圧力Ｐ、で停止する０ 以上のよ５に本実施例によれば、ポンプ故障時に、速度
制御運転より定速運転に切替えるため、始動時の立上り
時間が短く、給水圧力が低下することのない効果がある
。In normal times, as explained in the conventional technology, the variable speed drive means N
No. 1 pump 4-1. Or, the No. 2 pumps are being operated alternately, but one of the pumps is overloaded, causing the thermal relay to operate and its contacts TH, a, or TH
, a closes, contacts R, c of relay R1 close.
is switched from side b to side a, and circuit A is selected. Therefore, depending on the position of the contacts Z and c of the alternating relay 22, it is directly connected to the power source pw, the electromagnetic contactor Mc or Mc4 is energized, and the pump 4-1 or pump 4-2 is operated. In this case, the pump has a starting pressure P as shown in FIG.
According to this embodiment, when the pump fails, the speed control operation is switched from the speed control operation to the constant speed operation, so the startup time is short and the water supply pressure is reduced. There is an effect that does not decrease.

〔発明の効果〕〔Effect of the invention〕

本発明によればポンプ故障時のバックアップが万全で、
この際の立上りが早く、圧力低下の生じることのない効
果がおる。特に〜住宅給水などの場合に、瞬間湯沸器を
使用した場合には急激な圧力変化がないため安全な使用
を期待できる。According to the present invention, there is complete backup in case of pump failure,
At this time, the rise is quick and there is no pressure drop. In particular, when using an instantaneous water heater for residential water supply, it can be expected to be safe to use because there is no sudden pressure change.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は給水系の構成図、第２図は給水系のポンプの運
転特性図、第３図は給水系のポンプの駆動回路、第４図
はその制御回路、第５図は本発明の直接電源に接続した
場谷のポンプの運転特性図、第６図は本発明の実施例で
ある制御回路を示す。 ４−１．ｊｌ−’ｌはポンプ、８は給水管、Ｔは圧力タ
ンク、ＦＮＶは可変速駆動手段、ＰＷはｔ′＃、、ｐｓ
は圧力センサー、Ｒ，、Ｚ、、Ｚ、は切換手悌　（図 α→ 第　３　図 第　４　凹Figure 1 is a configuration diagram of the water supply system, Figure 2 is a diagram of the operating characteristics of the pump in the water supply system, Figure 3 is the drive circuit for the pump in the water supply system, Figure 4 is its control circuit, and Figure 5 is the diagram of the pump of the present invention. FIG. 6, an operating characteristic diagram of a Batani pump connected directly to a power source, shows a control circuit according to an embodiment of the present invention. 4-1. jl-'l is the pump, 8 is the water supply pipe, T is the pressure tank, FNV is the variable speed drive means, PW is t'#,, ps
are pressure sensors, R,, Z,, Z are switching handles (Fig. α → Fig. 3 Fig. 4 concave

Claims (1)

【特許請求の範囲】[Claims] 複数台のポンプとこれらのポンプを駆動する可変速駆動
手段と、ポンプ故障時に可変速駆動手段より電源に切替
える切替手段と、これらのポンプの吐出し側に連結した
給水管と、圧力タンクと、この給水管に設けた圧力セン
サーとで構成し、平常時は需要水量の変動に応じて前記
複数台のポンプの運転速度を変えて、あるいは台数制御
を行つて、給水管内の圧力を所定値に制御して給水を行
つてゆくものに於いて、これらポンプのうち１台のポン
プが故障した時、前記切替手段を動作させて、前記可変
速駆動手段による運転から直接電源による運転へ切替え
て正常なポンプの運転を行うようにしたことを特徴とす
る給水装置。A plurality of pumps, variable speed drive means for driving these pumps, switching means for switching from the variable speed drive means to a power source when the pumps fail, a water supply pipe connected to the discharge side of these pumps, a pressure tank, The system consists of a pressure sensor installed in this water supply pipe, and under normal conditions, the pressure inside the water supply pipe is maintained at a predetermined value by changing the operating speed of the plurality of pumps or controlling the number of pumps according to fluctuations in water demand. In a system that supplies water under controlled conditions, when one of these pumps breaks down, the switching means is operated to switch from operation using the variable speed drive means to operation using the direct power supply and normal operation is performed. A water supply device characterized in that it operates a pump.